Entry in Gatschet and Swanton, Atakapa Dictionary for the word Tsayon including the the phrase Tsayon né.

The Atakapa people of southwestern Louisiana used the phrase Tsayon Né to denote the land across the Sabine River: “Spanish Land.” It denoted Spanish North America before 1821. It denoted Mexico from 1821 until 1836, and it denoted Texas from 1836. But when the Atakapa people in Calcasieu Parish, Louisiana, said Tsayon Né, it meant the part of Texas they found right across the Sabine River: what we call southeastern Texas today.